OK - got it ... rebuild-daily helps to solve this problem. Restart now looks like and it works again ...
Hope it helps you to fix these thing if it occurs on your system -frank pi@raspberrypi:/etc/weewx $ sudo wee_database weewx.conf --rebuild-daily Using configuration file weewx.conf Using database binding 'wx_binding', which is bound to database 'archive_sqlite' All daily summaries will be rebuilt. Proceed (y/n)? y Rebuilding daily summaries in database 'weewx.sdb' ... Records processed: 205000; Last date: 2017-03-25 21:40:00 CET (1490474400) Processed 205044 records to rebuild 193 day summaries in 349.62 seconds Rebuild of daily summaries in database 'weewx.sdb' complete pi@raspberrypi:/etc/weewx $ sudo /etc/init.d/weewx restart;tail -f /var/log/ syslog [....] Restarting weewx (via systemctl): weewx.service. Mar 25 22:53:57 raspberrypi systemd[1]: Starting LSB: weewx weather system ... Mar 25 22:53:58 raspberrypi weewx[1303]: engine: Initializing weewx version 3.7.1 Mar 25 22:53:58 raspberrypi weewx[1303]: engine: Using Python 2.7.9 (default , Sep 17 2016, 20:26:04) #012[GCC 4.9.2] Mar 25 22:53:58 raspberrypi weewx[1303]: engine: Platform Linux-4.4.50-v7+- armv7l-with-debian-8.0 Mar 25 22:53:58 raspberrypi weewx[1303]: engine: Locale is 'de_DE.UTF-8' Mar 25 22:53:58 raspberrypi weewx[1303]: engine: pid file is /var/run/weewx. pid Mar 25 22:53:58 raspberrypi weewx[1308]: engine: Using configuration file / etc/weewx/weewx.conf Mar 25 22:53:58 raspberrypi weewx[1308]: engine: Loading station type WeatherLink (user.wlink) Mar 25 22:53:58 raspberrypi weewx[1292]: Starting weewx weather system: weewx. Mar 25 22:53:58 raspberrypi systemd[1]: Started LSB: weewx weather system. Mar 25 22:53:58 raspberrypi weewx[1308]: wlink: version is 0.11rc1 Mar 25 22:53:58 raspberrypi weewx[1308]: wlink: expecting HTML format 'B' Mar 25 22:53:58 raspberrypi weewx[1308]: wlink: polling interval is 60.0 Mar 25 22:53:58 raspberrypi weewx[1308]: engine: StdConvert target unit is 0x1 Mar 25 22:53:58 raspberrypi weewx[1308]: wxcalculate: The following values will be calculated: barometer=prefer_hardware, windchill=prefer_hardware, dewpoint=prefer_hardware, appTemp=prefer_hardware, rainRate=prefer_hardware, windrun=prefer_hardware, heatindex=prefer_hardware, maxSolarRad= prefer_hardware, humidex=prefer_hardware, pressure=prefer_hardware, inDewpoint=prefer_hardware, ET=prefer_hardware, altimeter=prefer_hardware, cloudbase=prefer_hardware Mar 25 22:53:58 raspberrypi weewx[1308]: wxcalculate: The following algorithms will be used for calculations: altimeter=aaNOAA, maxSolarRad=RS Mar 25 22:53:58 raspberrypi weewx[1308]: engine: Archive will use data binding wx_binding Mar 25 22:53:58 raspberrypi weewx[1308]: engine: Record generation will be attempted in 'hardware' Mar 25 22:53:59 raspberrypi weewx[1308]: engine: The archive interval in the configuration file (300) does not match the station hardware interval ( 60). Mar 25 22:53:59 raspberrypi weewx[1308]: engine: Using archive interval of 60 seconds (specified by hardware) Mar 25 22:53:59 raspberrypi weewx[1308]: engine: Using binding 'wx_binding' to database 'weewx.sdb' Mar 25 22:53:59 raspberrypi weewx[1308]: manager: Starting backfill of daily summaries Mar 25 22:53:59 raspberrypi weewx[1308]: restx: StationRegistry: Registration not requested. Mar 25 22:53:59 raspberrypi weewx[1308]: restx: Wunderground: Posting not enabled. Mar 25 22:53:59 raspberrypi weewx[1308]: restx: PWSweather: Posting not enabled. Mar 25 22:53:59 raspberrypi weewx[1308]: restx: CWOP: Posting not enabled. Mar 25 22:53:59 raspberrypi weewx[1308]: restx: WOW: Posting not enabled. Mar 25 22:53:59 raspberrypi weewx[1308]: restx: AWEKAS: Posting not enabled. Mar 25 22:53:59 raspberrypi weewx[1308]: restx: Weather365: service version is 1.0.2 Mar 25 22:53:59 raspberrypi weewx[1308]: restx: Weather365: Data will be uploaded for station id L25CDPSV95 Mar 25 22:53:59 raspberrypi weewx[1308]: engine: Starting up weewx version 3.7.1 Mar 25 22:53:59 raspberrypi weewx[1308]: engine: Starting main packet loop. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.